According to 9to5mac.com, the new spec was "quietly introduced" at the Cupertino giant's yearly developers conference and could be bad news for the standard 3.5mm headphone jack.

It's claimed that headphones connecting to iOS devices through the Lightning port will be able to receive a lossless stereo 48kHz digital audio output and send a mono 48kHz digital input. This could pave the way for headphones with superior built-in DACs that bypass the digital-to-analogue converter in the iDevice itself.

Meanwhile, third-party manufactures will also have the chance to make use of Apple Headphone Remote volume controls and other buttons that either launch apps or control playback.

It's also thought that using the Lightning Port will let headphones get power from an Apple device and therefore remove the need for manufacturers to create products such as noise-cancelling cans with internal batteries.